Me, yes: https://www.gwern.net/Spaced-repetition#how-much-to-add https://www.gwern.net/Spaced-repetition#how-much-to-add The XKCD comic you're thinking of is m

Me, yes: https://www.gwern.net/Spaced-repetition#how-much-to-add https://www.gwern.net/Spaced-repetition#how-much-to-add The XKCD comic you're thinking of is much more general^: https://xkcd.com/1205/ https://xkcd.com/1205/ ^ and not too helpful here because it assumes you know how much time something saves/costs - which isn't obvious for spaced repetition because the entire point is to dynamically adjust the timing & number of repetitions over the long run.